Allan McNamara of Middlesbrough, North Yorkshire, who filmed the sheep grazing in a field, insists it is genuine, though.

He wrote on his YouTube page: "He was born with his head the wrong way round. He lives happily and has been checked by a Vet to ensure he is in no pain. He can eat, sleep and do everything other sheep can."

Mr McNamara has posted further pictures of the sheep online in a bid to clear up the confusion.